{"cve":"CVE-2026-45399","nvd":{"published":"2026-05-15T20:16:48.950","modified":"2026-06-17T10:52:01.053","status":"Analyzed","description":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, any authenticated user with low privileges can enumerate active background tasks across the system and stop tasks belonging to other users via the GET /api/tasks and POST /api/tasks/stop/{task_id} methods. This allows a casual user to disrupt system-wide chat usage by continuously canceling other users' active tasks. This is a real authorization vulnerability affecting integrity and usability in multi-user deployments. This vulnerability is fixed in 0.9.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H","score":7.1},"cwes":["CWE-862"],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-8jjp-r2w2-4v22","https://github.com/open-webui/open-webui/security/advisories/GHSA-8jjp-r2w2-4v22"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-45399","score":0.0027,"percentile":0.19198,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8jjp-r2w2-4v22","url":"https://osv.dev/vulnerability/GHSA-8jjp-r2w2-4v22","summary":"Open WebUI: Low-privilege authenticated users can enumerate and stop global background tasks, causing system-wide chat disruption","modified":"2026-07-13T16:43:27.479448751Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.0"],"fixed":["0.9.0"]}]},{"id":"PYSEC-2026-2714","url":"https://osv.dev/vulnerability/PYSEC-2026-2714","summary":"Open WebUI: Low-privilege authenticated users can enumerate and stop global background tasks, causing system-wide chat disruption","modified":"2026-07-13T16:32:16.650219026Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.0"],"fixed":["0.9.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}